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为了评定气体密度变化对小口径气体涡轮流量计的影响，本文给出了对一个口径为10mm（DN10）的气体涡轮流量计的变密度试验结果和一些试验误差曲线。试验前，首先使用一个旋转活塞式标准流量计，以空气为介质，在绝对压力0．2MPa下，对DN10气体涡轮流量计进行了检定。该标准流量计可溯源到一个国外试验室。然后，再分别使用氮气（N2）、氩气（Ar）、氦气（He）以及空气（air）在0．2MPa和0．9Mpa工作压力下对该DN10气体涡轮流量计进行了检定试验。试验结果表明，当气体密度ρ，在0．3Kg／m3和1．5Kg／m3之间变化时,气体涡轮流量计的试验误差曲线随着气体密度变化而变化,其最大偏差值为％。当使用空气介质做试验时，其试验结果的复现性误差优于±0．5％、而用其它种类气体时，复现性误差约为±4％。在工作压力为0．2MPa下，使用空气、氩气和氮气的试验误差曲线在形状和数值上都相近；而在同样压力下，氦气的试验误差曲线与上述气体的误差曲线相差很大。值得注意；在0．2MPa工作压力下，空气、氩气和氮气的密度值约为2～3Kg／m3，而氦气价密度约为0．3泌Kg／m3。换句话说，在0．9MPa工作压力下，氦气的密度约为1．5Kg／m3。其误差曲线接近于上述气体在0．2MPa工作压力下的误差曲线。亦即对于小口径的气体涡
In order to evaluate the influence of gas density on the small diameter gas turbine flowmeter, this paper presents the results of variable density test and some experimental error curves of a gas turbine flowmeter with a diameter of 10mm (DN10). Before the test, the first use of a rotary piston standard flow meter, air as a medium, at an absolute pressure of 0.2MPa, DN10 gas turbine flow meter was tested. The standard flowmeter can be traced to a foreign laboratory. The DN10 gas turbine flowmeter was then tested at 0.2 MPa and 0.9 MPa operating pressures using nitrogen (N2), argon (Ar), helium (He) and air respectively. The experimental results show that when the gas density ρ changes between 0.3Kg / m3 and 1.5Kg / m3, the experimental error curve of the gas turbine flowmeter changes with the gas density, and the maximum deviation is%. The reproducibility error of the test results is better than ± 0.5% when using air media, while the reproducibility error is ± 4% with other types of gases. At working pressure of 0.2 MPa, the experimental error curves of air, argon and nitrogen are similar in shape and value. However, under the same pressure, the experimental error curve of helium differs from the error curve of the above gases. It is noteworthy that at 0.2MPa working pressure, the density of air, argon and nitrogen is about 2 ~ 3Kg / m3, while that of helium is about 0.3Kg / m3. In other words, at a working pressure of 0.9 MPa, the density of helium is about 1.5 kg / m3. The error curve is close to the error curve of the gas at 0.2MPa working pressure. That is, for a small diameter gas vortex